Two law firms that represented customers caught up in the collapse of MF Global Holdings Ltd. (MFGLQ) have linked up to prepare a class-action lawsuit on behalf of clients of Peregrine Financial Group Inc.

Berger & Montague PC and Collett Legal are discussing such a suit with former customers of Peregrine, which collapsed into bankruptcy this week after its chief executive attempted suicide and regulators alleged hundreds of millions of dollars in client money had gone missing.

"We're getting this process going," said Greg Collett, principal at Collett Legal.

Lawyers for the two firms are still evaluating where the case should be filed and which Peregrine officials it should be filed against, though Peregrine CEO Russell Wasendorf Sr. is likely to be named, Mr. Collett said.

A filing could come as early as next week, he said.

Berger & Montague in May was named co-lead counsel for civil lawsuits brought against MF Global, following the January filing of a class-action lawsuit against former MF Global CEO Jon Corzine and other officials of that firm. The action seeks to reclaim missing customer money, with about $1.6 billion in client assets yet to be returned more than nine months following MF Global's demise.

Collett had represented about 150 MF Global customers in class action against MF Global, and continues to represent customers of that firm in other litigation against it.

Executives whose companies fall into bankruptcy tend to be targets of such class-action lawsuits, as bankruptcy proceedings typically prevent such firms from being sued, Mr. Collett said. The class-action lawsuits can target individuals, their assets and entities related to the collapsed company.

The effort has the backing of the Commodity Customer Coalition, an ad hoc group of asset-management firms and commodity traders formed following the downfall of MF Global in October 2011 to assert the views of clients in bankruptcy court and keep former customers up to date on legal proceedings.

The group, which includes some former clients of Peregrine, has stepped into a similar role after that firm ran aground earlier this week.

Mr. Wasendorf was arrested Friday on charges of lying to federal market regulators.

Write to Jacob Bunge at jacob.bunge@dowjones.com; Twitter: @jacobbunge

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